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(FRAME-INFO (STRING "Summary, Somatic Motor Nuclear Groups. \(Images modified with permission from Patton et al., Introduction to Basic Neurology. WB Saunders Co., 1976\). The somatic motor \(Somatic Efferent\) nuclei in the brainstem innervate skeletal muscles in the head that originated from occipital somites. They are all located close to the midline. Top: oculomotor and trochlear nuclei seen in schematic cross sections through the superior collicular and inferior collicular levels of the midbrain respectively. Bottom Left: abducens nucleus in a caudal pontine section. Note the internal genu of the facial motor nerve swinging around the abducens nucleus, and the exiting abducens and facial nerves, characteristic of this level. These nerves \(III, IV, VI\) cause eye movements. Bottom Right: hypoglossal nucleus in a medulla section. The hypoglossal nerve \(XII\) causes tongue movements. The \(spinal\) accessory nucleus is not shown here. It is located in the cervical spinal cord. The accessory nerve \(XI\) causes head and neck movements. It fits most sensibly with the somatic efferent group since the sternocleidomastoid and trapezius muscles which it innervates may arise from cervical somites \(though some texts put it with the branchial efferent group\)."))
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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(REGION (TYPE "STRUCT")
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